[Android] Help ! ! Qt how to achieve monitoring function ? ? ? ? ? ?

Just wanted to fire one second every 0.5 seconds to automatically detect a function's return value is 0 ? ? ?
Jiji Ji ! ! ! Great God seeking guidance
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you have 2 ways
1. your class inherits from QObject, and to achieve virtual void timerEvent (QTimerEvent * event), and then start when the call startTimer (500), in your judgment you timerEvent function in that return Value

2. Creating a QTimer object
QTimer * timer = new QTimer (this);
connect (timer, SIGNAL (timeout ()), this, SLOT (update ()));
timer-> start (500);

judgment in doing udpate function

PS: These help documentation has
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seemingly use the timer ? Or function inside emit a signal out
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with timer
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help documentation in English and none of them
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help documentation in English    and none of them  

. . . . As a programmer, English is one of the more basic skills , how proficient is not required , at least be able to read about the meaning , it is not, do not understand what the word can also be translated ah